(2013·安徽高考)It ________ be the vocabulary that caused you the problem in the exercise because you know a lot of words.

Amay Bcouldn't

Cshould Dneedn't

 

B

【解析】B 考查情態(tài)動詞的用法。句意:你難以完成那道練習題不可能是詞匯量的原因,因為你掌握了大量的詞匯。根據(jù)原因狀語從句because you know a lot of words可知,主句應(yīng)該是否定的,A項和C項可排除;needn't表示不必,不符合題意。此處表示可能性,故選B

 

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